Patents by Inventor Abbott W. Lahti

Abbott W. Lahti has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4341982
    Abstract: A system for simultaneously and independently controlling a plurality of electric motors from a number of dispersed stations. The system operates by transmission of duty cycle modulated selected frequencies superimposed on a DC track voltage on a common power line servicing the motors. The modulation is variable and determines the speed of the motors. Transmitters are portable and designed removably to plug into a common signal transmission cable anywhere along its length without interaction. Receivers, each tuned to a specific frequency and associated with and controlling a motor, are coupled to the common power line.
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: July 27, 1982
    Assignee: Power Systems, Inc.
    Inventors: Abbott W. Lahti, Stephen R. Russell